package com.hmdp.service.impl;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.Shop;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisConstants;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.ArrayList;
import java.util.List;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result queryTypeList() {
        // 1.向Redis里查询
        String key = RedisConstants.CACHE_SHOP_TYPE_KEY;
        String shopTypeJson = stringRedisTemplate.opsForValue().get(key);

        // 查询到直接返回
        if (StrUtil.isNotBlank(shopTypeJson)) {
            List<ShopType> shopTypes = JSONUtil.toList(shopTypeJson, ShopType.class);
            return Result.ok(shopTypes);
        }

        // 查询不到，查询数据库
        List<ShopType> shopTypes = query().orderByAsc("sort").list();

        //  如果不存在，返回错误
        if (shopTypes == null) {
            return Result.fail("店铺类型不存在");
        }

        // 写入到Redis
        stringRedisTemplate.opsForValue().set(key,JSONUtil.toJsonStr(shopTypes));
        // 返回
        return Result.ok(shopTypes);
    }

    @Override
    public Result queryShopTypeList() {
        // 1.向Redis里查询
        String key = RedisConstants.CACHE_SHOP_TYPE_KEY;
        List<String> shopTypeJsonList = stringRedisTemplate.opsForList().range(key, 0, -1);

        // 查询到直接返回
        if (shopTypeJsonList != null && !shopTypeJsonList.isEmpty()) {
            ArrayList<ShopType> shopTypes = new ArrayList<>();
            for (String s : shopTypeJsonList) {
                shopTypes.add(JSONUtil.toBean(s,ShopType.class));
            }
            return Result.ok(shopTypes);
        }

        // 查询不到，查询数据库
        List<ShopType> shopTypes = query().orderByAsc("sort").list();

        //  如果不存在，返回错误
        if (shopTypes == null || shopTypes.isEmpty()) {
            return Result.fail("店铺类型不存在");
        }

        // 写入到Redis
        for (ShopType shopType : shopTypes) {
            stringRedisTemplate.opsForList().rightPushAll(key,JSONUtil.toJsonStr(shopType));
        }
        // 返回
        return Result.ok(shopTypes);
    }


}
